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sift/docs/implementer-log.md
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kyleandornith-1.5-35b-a3b bb9a6544d1 pdfpool: a few extraction slots, a short queue, single-flight, one job per caller
Generic in-process scheduler for the expensive PDF-extraction child process.
A pool runs at most `slots` jobs, keeps at most `queue` waiting, and refuses a
waiter past `wait`. Do() applies six rules in order: join an existing running
or queued job (no slot, allowed while the caller holds another, fn may be nil);
refuse a caller that already has a job in flight; take a free slot, else queue
(first-come-first-served, else ErrBusy); run fn under context.WithoutCancel so
the flight outlives a caller that leaves; broadcast the result to every sharer
with no caching and a recovered panic returned as an error. Running counts only
jobs holding a slot; Queued counts the line; Waiting(key) counts joiners.

Co-Authored-By: ornith-1.5-35b-a3b <ornith-1.5-35b-a3b@llama.cpp.invalid>
2026-09-25 23:32:16 -07:00

3.0 KiB

Implementer log

One row per task session that ends in a commit. Newest last.

Task Date Status Sessions Gate Deviations Summary
p5a/01-kind-fetch 2026-09-25 done resumed gate: ok none Implemented Kind/application/pdf recognition, PDF body cap (100 MB) and deadline (120 s), and FetchIf with If-None-Match/If-Modified-Since via shared doFetch. Previous session could not pass TestFetchIf only because the given test held its mutex across the handler (deadlock); owner fixed the test. Session resumed after that fix — did not rewrite fetch code, only verified rules and ran gate.
p5a/02-pdftext 2026-09-25 done 1 gate: ok none Built the child-extraction package: Extract (reader.Open with ErrWrongPassword→ErrEncrypted, per-page recover, trailer /Info /Title, rule-3 UTF-16BE/Latin-1 decode), outline.go (/Dest and /GoTo /A dests, 10k-item and no-double-visit bounds, never-nil outline), Runner (re-exec'd child, env-isolated via empty env, 60 s deadline, 64 MiB output cap, 200 MiB stdin cap, stderr capped at 4 KiB, exit-code→error mapping, Doc parse plus ErrNoText), and the sift pdftext case in main.go. Removed the tools.go module pin; go.mod/go.sum/vendor/modules.txt confirmed unchanged. All 10 given tests pass under -race -count=3 including the deadline-kill test; make gate ok; given files byte-identical; `printf nope
p5a/03-dcache 2026-09-25 done 1 gate: ok evict() tie-break Added the pdf_doc/pdf_page tables, PDFEntry/PDFKey/PutPDF/GetPDF/TouchPDF (one-tx write deleting old pages first, page-ordered read, 304 touch moves only fetched_at), PDFH/PDFM counters, Size() including pdf_doc nbytes. One deviation: extended the eviction union with pdf_doc and added rowid ASC to the ORDER BY so same-second puts evict in insertion order (deterministic whole-document eviction); without it TestPDFEviction is order-dependent. Left Stats() signature unchanged for task 07. Given test byte-identical.
p5a/04-pdfpool 2026-09-25 done 1 gate: ok none Implemented the generic scheduler. Pool holds one mutex, a jobs map (key→in-flight job), a callerJobs map (caller→their job), and a FIFO waiters line. Do applies the six rules in order: join (counted in Waiting, no slot, allowed while the caller holds another job, fn may be nil), caller-busy, then slot/queue/refuse. A job's result is broadcast to every sharer via a done channel; results are not cached (key forgotten on finish). fn runs under context.WithoutCancel so the flight outlives a caller that leaves. Panic in fn is recovered into an error, freed the slot and caller. One implementation finding (not a plan deviation): queued jobs must not be counted in Running(), so startLocked only registers a job and a separate takeSlotLocked/grant increments the slot count — abandoning a queued starter (abandon) releases sharers without touching the slot. Given test byte-identical.